CN113856444A - Method for preparing ammonia water from aerobic composting waste gas for flue gas SNCR (selective non-catalytic reduction) denitration - Google Patents

Method for preparing ammonia water from aerobic composting waste gas for flue gas SNCR (selective non-catalytic reduction) denitration Download PDF

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CN113856444A
CN113856444A CN202111312182.2A CN202111312182A CN113856444A CN 113856444 A CN113856444 A CN 113856444A CN 202111312182 A CN202111312182 A CN 202111312182A CN 113856444 A CN113856444 A CN 113856444A
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absorber
ammonia water
waste gas
sncr
aerobic
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韩张亮
周一诺
蓝森琛
庞小兵
孙德智
刘华清
胡丽玲
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Shaoxing Research Institute Of Zhejiang University Of Technology
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Shaoxing Research Institute Of Zhejiang University Of Technology
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
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    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1406—Multiple stage absorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/18—Absorbing units; Liquid distributors therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • C—CHEMISTRY; METALLURGY
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    • C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
    • C01C1/00—Ammonia; Compounds thereof
    • C01C1/02—Preparation, purification or separation of ammonia
    • C01C1/022—Preparation of aqueous ammonia solutions, i.e. ammonia water
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    • C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
    • C05F17/60—Heating or cooling during the treatment
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
    • C05F17/90—Apparatus therefor
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
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    • C05F17/964—Constructional parts, e.g. floors, covers or doors
    • C—CHEMISTRY; METALLURGY
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    • C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
    • C05F17/90—Apparatus therefor
    • C05F17/964—Constructional parts, e.g. floors, covers or doors
    • C05F17/971—Constructional parts, e.g. floors, covers or doors for feeding or discharging materials to be treated; for feeding or discharging other material
    • C05F17/979—Constructional parts, e.g. floors, covers or doors for feeding or discharging materials to be treated; for feeding or discharging other material the other material being gaseous
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    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse

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Abstract

The invention discloses a method for preparing ammonia water from aerobic composting waste gas for SNCR (selective non-catalytic reduction) denitration of flue gas, which is characterized in that the waste gas generated by an aerobic fermentation tank is introducedThe aerobic fermentation tank is selectively connected with each absorber, and the absorbers are respectively provided with a water inlet pipeline for adding water; and (3) sequentially and alternately and circularly introducing waste gas generated by the aerobic fermentation tank into each absorber, sequentially passing the waste gas through other absorbers, diluting the ammonia water solution directly introduced into the absorber of the waste gas by a dilution system, and introducing the diluted ammonia water solution into the SNCR reactor. NH generated by composting according to the invention3The prepared ammonia water can provide a reducing agent for SNCR denitration in a park, so that the cost of adopting commercial ammonia water is obviously reduced; and the multi-stage absorber alternately dissolves and absorbs the waste gas, so that the waste gas is more efficiently and fully utilized.

Description

Method for preparing ammonia water from aerobic composting waste gas for flue gas SNCR (selective non-catalytic reduction) denitration
Technical Field
The invention relates to the technical field of waste gas treatment, in particular to a method for preparing ammonia water from aerobic composting waste gas for flue gas SNCR denitration.
Background
The industrial park is a booster for adjusting the regional economic structure and is also an important power for propelling urbanization. In recent years, various parks are actively established all over the country according to the characteristics and conditions of the parks. At present, there are five hundred national grades of regions of passing through the division, export processing, bonded areas, etc. One thousand development areas in provincial level and twenty thousand industrial parks in the whole country. The method becomes one of the important development strategies in China according to the target requirements of rapid economic development and environmental protection, and the sustainable development mode becomes an important mode for the optimized development of industrial parks in China. However, the large quantities of organic solid waste and NOx-containing waste gases produced in industrial parks are detrimental to sustainable development of the parks. With the requirements of industrial development on resource consumption and environmental pollution prevention and control, particularly the gradual depletion of disposable resources, the vein industrial park becomes a key development type park for realizing high-efficiency comprehensive utilization of resources in future in China. The vein industrial park is an ecological industrial park taking vein industry as a leading part, and the vein industry transforms the traditional linear economic mode of 'resource-product-waste' into a closed-loop economic mode of 'resource-product-renewable resource' as much as possible, so that the domestic and industrial garbage is changed into valuable and recycled.
Aerobic composting is an effective organic solid waste treatment mode. The organic solid waste after aerobic composting realizes harmlessness, reduction and stabilization, and can be used as forest land fertilizer and the like. However, organic solid wastes discharge a large amount of ammonia (NH) during aerobic composting3)。NH3Is the formation of nitrogen oxides (NOx) and PM2.5The important precursors of the compound not only can harm human health, but also can aggravate atmospheric pollution. And NH3Is also a chemical raw material and can be used for preparing ammonia water. Because of the industrial preparation of NH3Consumes a large amount of energy and simultaneously generates NH3A large amount of greenhouse gases are also emitted in the preparation process. If the NH discharged by the organic solid waste in the aerobic composting process can be discharged3Recycle, not only can avoid NH3Directly discharged into the ambient air, reduces the environmental hazard and also reduces the preparation of NH3The energy consumption and the early greenhouse emission are caused.
The flue gas emitted by enterprises and electric power industries covered by industrial parks usually contains a large amount of NOx. NOx abatement is carried out by Selective Catalytic Reduction (SCR) or selective non-catalytic reduction (SNCR) before its emission. SCR is the injection of NH into the flue gas upstream of a catalyst3Or other suitable reducing agents, and converting NOx in the flue gas into nitrogen and water by using a catalyst (such as alkali metals including iron, vanadium and the like) at the temperature of 200-450 ℃. Because of NH3Of the selective nature of (1) reacting only with NOx, substantially not with O2The reaction is called selective catalytic reduction denitration. The reducing agent usually used is liquid pure ammonia or aqueous ammonia (aqueous ammonia solution). The SNCR technique is to use NH3Reducing agents such as urea and the like are sprayed into the furnace to selectively react with NOx, and the process does not use a catalyst, so the reducing agents are added into a high-temperature zone (850-1100 ℃), and NOx in the flue gas is selectively reduced to generate N2The reducing agent in the process is basically not mixed with O in the flue gas2And (4) acting. SNCR has in comparison with SCRSimple process, low energy consumption and the like. However, large scale SNCR use is limited by the relatively expensive reducing agents. Ammonia water is a commonly used SCR and SNCR reducing agent, if the ammonia water can discharge NH generated by organic solid wastes in a park in an aerobic composting process3The ammonia water is recycled, so that the problem of high cost of the SNCR reducing agent is solved.
The denitration section of the SNCR needs high temperature maintenance, and a large amount of heat energy is wasted. The reaction speed is accelerated, the composting treatment efficiency is improved, and the quality of compost products is improved when the environmental temperature of the composting reactor is increased.
Currently, NH for discharging organic solid waste through aerobic composting is lacked3And a process for preparing coarse ammonia water for denitration combination. The technology is favorable for realizing the purpose of changing waste into valuable from solid waste in the park, provides economic and simple raw materials for waste gas denitration, provides a way for the effluent of a sewage treatment plant, and is an important technical scheme for realizing the low-carbon treatment of three wastes and closed-loop recycling in the park. Therefore, a method for preparing ammonia water from the aerobic composting waste gas of the organic solid wastes in the industrial park for SNCR flue gas denitration needs to be established.
Disclosure of Invention
The invention aims to provide a method for preparing ammonia water from aerobic composting waste gas for flue gas SNCR denitration, which is suitable for industrial parks with high efficiency and low cost, so as to overcome the defects in the prior art.
In order to achieve the above purpose, the invention provides the following technical scheme: a method for preparing ammonia water from aerobic composting waste gas for SNCR denitration of flue gas is characterized in that the waste gas generated by an aerobic fermentation tank is introduced into an absorption system, the absorption system comprises a plurality of absorbers which are sequentially and circularly connected, the aerobic fermentation tank is selectively connected with each absorber, and the absorbers are respectively provided with a water inlet pipeline for adding water;
and (2) sequentially and alternately and circularly introducing the waste gas generated by the aerobic fermentation tank into each absorber, sequentially passing the waste gas through other absorbers, diluting the ammonia water solution directly introduced into the absorber of the waste gas by a dilution system, and introducing the diluted ammonia water solution into the SNCR reactor.
Preferably, the number of absorbers is at least three.
Preferably, the number of the absorbers is three, and the absorbers are respectively a first absorber, a second absorber and a third absorber;
the method comprises the following steps:
introducing waste gas generated by the aerobic fermentation tank into a first absorber, discharging the waste gas after the waste gas sequentially passes through a second absorber and a third absorber, diluting an ammonia water solution in the first absorber by a dilution system, and introducing the diluted ammonia water solution into an SNCR reactor;
introducing waste gas generated by the aerobic fermentation tank into a second absorber, discharging the waste gas after the waste gas sequentially passes through a third absorber and the first absorber, diluting an ammonia water solution in the second absorber through a dilution system, and introducing the diluted ammonia water solution into an SNCR reactor;
introducing waste gas generated by the aerobic fermentation tank into a third absorber, discharging the waste gas after the waste gas sequentially passes through the first absorber and the second absorber, diluting an ammonia water solution in the third absorber by a dilution system, and introducing the diluted ammonia water solution into the SNCR reactor;
and repeating the steps and circularly operating.
Preferably, the gas outlet pipeline of the aerobic fermentation tank and the gas outlet pipeline of the absorber are respectively provided with NH3And (5) detecting an alarm.
Preferably, the water added in the absorber is sewage plant water.
Preferably, the water inlet pipeline, the water outlet pipeline, the air inlet pipeline, the exhaust pipeline and the connecting pipeline between the absorbers are respectively provided with an electromagnetic valve.
Preferably, the absorbers are respectively provided with an ammonium ion detector.
Preferably, the diluting system sequentially comprises an ammonia water storage tank, an ammonia water pressure pump, a dilute ammonia water tank and a dilute ammonia water pressure pump, wherein the ammonia water storage tank is connected with the absorber, and the dilute ammonia water pressure pump is connected with the SNCR reactor; the diluted ammonia water tank is provided with a dilution water inlet, and the dilution water is reclaimed water in a sewage plant.
Preferably, a circulating heat exchange system is arranged between the SNCR reactor and the aerobic fermentation tank and is used for transferring the heat of the SNCR reactor to the aerobic fermentation tank; the medium of the circulating heat exchange system is water in a sewage plant.
Preferably, the exhaust pipeline of the absorber is connected with the inlet end of the dilute ammonia water tank.
Compared with the prior art, the invention has the advantages that:
1. NH generated by composting according to the invention3The prepared ammonia water can provide a reducing agent for SNCR denitration in a park, so that the cost of adopting commercial ammonia water is obviously reduced; and the multi-stage absorber alternately dissolves and absorbs the waste gas, so that the waste gas is more efficiently and fully utilized.
2. The invention adopts the effluent of a sewage treatment plant as NH3Absorbing the absorption liquid by using a multistage absorption method to absorb the discharged NH of the aerobic compost3The ammonia water is prepared, the water in the garden can be recycled economically and conveniently, and simultaneously NH in waste gas generated by aerobic composting is effectively removed3。
3. The invention adopts gas generated by a ventilation system of aerobic composting to convert NH3After absorption, the compost waste gas such as the contained VOCs can enter the SNCR system to be removed through combustion, thereby avoiding discharging NH from the compost3The recovered waste gas is treated, so that the investment is reduced; in addition, compost waste gas still will be as power, promotes weak aqueous ammonia and gets into the SNCR system, the energy saving consumes.
4. The invention transfers the heat of the SNCR reactor to the sewage water of the industrial park sewage plant through heat exchange by the circulating heat exchange system, and transfers the heat to the aerobic composting reactor, thereby providing higher temperature for the aerobic composting, accelerating the reaction rate and improving the composting efficiency.
Drawings
FIG. 1 is a schematic flow chart of the technical solution of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further specifically described below by way of embodiments in combination with the accompanying drawings.
Example (b): a method for preparing ammonia water from aerobic composting waste gas for flue gas SNCR denitration is disclosed, as shown in figure 1, dissolving the waste gas generated by an aerobic fermentation tank into ammonia water solution through an absorption system, and then diluting the ammonia water solution through a dilution system to be used as a reducing agent in a denitration process of an SNCR reactor.
The absorption system comprises three absorbers, namely a first absorber, a second absorber and a third absorber, wherein the top of each absorber is provided with a water inlet pipeline and an exhaust pipeline, and the bottom of each absorber is provided with a gas inlet pipeline and a water outlet pipeline; in addition, the relative tops of the three absorbers are connected in a circulating mode through pipelines, namely the first absorber is connected with the second absorber, the second absorber is connected with the third absorber, and the third absorber is connected with the first absorber.
In the structure, the water inlet pipelines of the first absorber, the second absorber and the third absorber are respectively provided with an electromagnetic valve 1, an electromagnetic valve 2 and an electromagnetic valve 3 which are respectively used for controlling the water in the sewage plant to enter the corresponding absorbers.
The exhaust pipelines of the first absorber, the second absorber and the third absorber are respectively provided with electromagnetic valves 4, 5 and 6 which are respectively used for controlling the emission of waste gas in the corresponding absorbers, and the exhaust pipelines of the first absorber, the second absorber and the third absorber are converged and then connected with the inlet end of a dilute ammonia water tank to be mixed with ammonia water in a denitration system, so that energy is saved.
And electromagnetic valves 7, 8 and 9 are respectively arranged on pipelines mutually connected among the first absorber, the second absorber and the third absorber and are respectively used for controlling the circulation of waste gas among the absorbers.
The air inlet pipelines of the first absorber, the second absorber and the third absorber are respectively provided with electromagnetic valves 10, 12 and 14 which are respectively used for controlling the waste gas discharged by the aerobic fermentation tank to enter the corresponding absorbers, and the air outlet pipelines of the aerobic fermentation tank are respectively communicated with the air inlet pipelines of the first absorber, the second absorber and the third absorber.
The water outlet pipelines of the first absorber, the second absorber and the third absorber are respectively provided with an electromagnetic valve 11, an electromagnetic valve 13 and an electromagnetic valve 15 which are respectively used for controlling the collection of ammonia water in the corresponding absorbers; and the water outlet pipelines of the first absorber, the second absorber and the third absorber are connected with a dilution system.
The diluting system comprises an ammonia water storage tank, an ammonia water pressure pump, a dilute ammonia water tank and a dilute ammonia water pressure pump which are connected in sequence, a water outlet pipeline of the absorber is connected with the ammonia water storage tank, and the dilute ammonia water pressure pump is connected with the SNCR reactor; the diluted ammonia water tank is provided with a dilution water inlet, and the dilution water is reclaimed water in a sewage plant. And after flowing into an ammonia storage tank, the ammonia water solution prepared by the absorber is conveyed to a dilute ammonia water tank through an ammonia water pressure pump, meanwhile, the sewage plant water is added into the dilute ammonia water tank for dilution to a specified concentration, and then the diluted ammonia water is conveyed to the SNCR reactor through the dilute ammonia water pressure pump to be used as a reducing agent.
In this embodiment, NH is respectively disposed on the gas outlet pipeline of the aerobic fermentation tank and the pipeline after the gas outlet pipeline of the absorber is converged3 Detection alarm instruments 16 and 17 for monitoring the NH outlet of the aerobic fermentation tank3Concentration and absorber exhaust NH3And (4) concentration.
In this embodiment, ammonium ion detectors 18, 19, and 20 are respectively disposed in the first absorber, the second absorber, and the third absorber, and are configured to monitor the ammonium ion concentration in the corresponding absorbers in real time.
In this embodiment, the reclaimed water discharged after the treatment in the industrial park sewage plant enters the absorbers to absorb NH in the waste gas3On one hand, the carrier enters a dilute ammonia water tank to be used for diluting the dilute water in the system, in addition, the embodiment also utilizes the water in the sewage plant to carry out heat exchange between the SNCR reactor and the aerobic fermentation tank, a circulating heat exchange system is arranged between the SNCR reactor and the aerobic fermentation tank, and the medium of the circulating heat exchange system is the water in the sewage plant. The denitration stage of the SNCR needs high-temperature maintenance, the heat generated by the SNCR reactor is transferred to reclaimed water through heat exchange by adopting a circulating heat exchange system, the reclaimed water circularly flows at the periphery of the SNCR reactor and the aerobic fermentation tank and then transfers the heat to the aerobic fermentation tank, higher temperature is provided for aerobic composting, the environmental temperature of the composting reactor is increased, the reaction rate is accelerated, the composting treatment efficiency is improved, the quality of compost products is improved, and the composting period is obviously shortened.
When the method provided by the embodiment is implemented specifically, the method comprises the following steps:
(1) the electromagnetic valves 1, 2 and 3 are opened, the reclaimed water discharged after being treated by the industrial park sewage plant enters the absorbers 1, 2 and 3, and the electromagnetic valves 1, 2 and 3 are closed after the specified liquid level is reached.
(2) On the other hand, the water in the sewage plant passes through the SNCR reactor which runs at high temperature, enters the heat exchange layer of the solid waste aerobic fermentation tank after heat exchange and temperature rise, and then returns to the heat exchange unit of the SNCR reactor. The water is circulated between the SNCR and the aerobic fermentor to maintain the aerobic fermentor temperature.
(3) In the solid waste aerobic composting process, a ventilation system of an aerobic fermentation tank operates, and the generated waste gas is conveyed to a first absorber. At this time, the electromagnetic valves 10, 7, 8 and 6 are opened, all other gas path electromagnetic valves are kept closed, and the waste gas path is the first absorber, the second absorber, the third absorber and the dilute ammonia water. The ammonium ion detectors 18, 19, 20 display the concentration of ammonium ions in the absorber in real time. NH (NH)3The detection alarm instruments 16 and 17 respectively display the NH of the aerobic fermentation tank and the exhaust pipeline of the absorber in real time3And (4) concentration.
(4) When the ammonium ion concentration of the ammonium ion detector 18 reaches the designated concentration of 25%, the electromagnetic valves 10, 7, 8 and 6 are closed. The electromagnetic valve 11 is opened, and the ammonia solution in the first absorber enters the ammonia water storage tank.
(5) The ammonia water in the ammonia water storage tank is diluted by a dilution system to 8-15%, and then enters the SNCR reactor to be used as a reducing agent.
(6) The gas discharged from the absorber 3 is conveyed to an ammonia water pressure pump through a pipeline, so that the auxiliary power effect of conveying ammonia water to a dilute ammonia water tank is achieved, and the energy consumption is reduced; in addition, the gas discharged from the absorber contains other waste gas, and enters the denitration device along with the dilute ammonia water to be combusted and decomposed under the action of high temperature.
(7) The electromagnetic valve 11 is closed, the electromagnetic valve 1 is opened, and the sewage plant water enters the first absorber, and after reaching the designated liquid level, the electromagnetic valve 1 is closed. At this time, the electromagnetic valves 12, 8, 9 and 4 are opened, all other gas path electromagnetic valves are kept closed, and the waste gas path is the second absorber, the third absorber, the first absorber and the dilute ammonia water. When the ammonium ion concentration of the ammonium ion detector 19 reaches the designated concentration of 25%, the electromagnetic valves 12, 8, 9 and 4 are closed, the electromagnetic valve 13 is opened, the ammonia solution in the absorber 2 enters the ammonia water storage tank, and the ammonia water in the ammonia water storage tank enters the SNCR reactor as a reducing agent after being diluted by the dilution system to reach the designated concentration.
(8) The electromagnetic valve 13 is closed, the electromagnetic valve 2 is opened, the sewage plant water enters the second absorber, and the electromagnetic valve 2 is closed when the liquid level reaches the designated liquid level. The solenoid valves 14, 9, 7 and 5 are opened, all other gas circuit solenoid valves are kept closed, and the waste gas path is a third absorber, a first absorber, a second absorber and dilute ammonia water. When the ammonium ion concentration of the ammonium ion detector 20 reaches the designated concentration of 25%, the electromagnetic valves 14, 9, 7 and 5 are closed, the electromagnetic valve 15 is opened, the ammonia solution in the absorber 3 enters the ammonia water storage tank, and the ammonia water in the ammonia water storage tank enters the SNCR reactor as a reducing agent after being diluted by the dilution system to reach the designated concentration. The electromagnetic valve 15 is closed, the electromagnetic valve 3 is opened, the sewage plant water enters the third absorber, and the electromagnetic valve 3 is closed when the liquid level reaches the designated liquid level.
(9) Returning to the step (3) and circularly operating.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims (10)

1. A method for preparing ammonia water from aerobic composting waste gas for SNCR (selective non-catalytic reduction) denitration of flue gas is characterized in that the waste gas generated by an aerobic fermentation tank is introduced into an absorption system, the absorption system comprises a plurality of absorbers which are sequentially and circularly connected, the aerobic fermentation tank is selectively connected with each absorber, and the absorbers are respectively provided with a water inlet pipeline for adding water;
and (2) sequentially and alternately and circularly introducing the waste gas generated by the aerobic fermentation tank into each absorber, sequentially passing the waste gas through other absorbers, diluting the ammonia water solution directly introduced into the absorber of the waste gas by a dilution system, and introducing the diluted ammonia water solution into the SNCR reactor.
2. The method for preparing ammonia water from aerobic composting waste gas for flue gas SNCR denitration according to claim 1, wherein the number of the absorbers is at least three.
3. The method for preparing ammonia water from aerobic composting waste gas for SNCR denitration of flue gas as claimed in claim 2, wherein the number of the absorbers is three, namely a first absorber, a second absorber and a third absorber;
the method comprises the following steps:
introducing waste gas generated by the aerobic fermentation tank into a first absorber, discharging the waste gas after the waste gas sequentially passes through a second absorber and a third absorber, diluting an ammonia water solution in the first absorber by a dilution system, and introducing the diluted ammonia water solution into an SNCR reactor;
introducing waste gas generated by the aerobic fermentation tank into a second absorber, discharging the waste gas after the waste gas sequentially passes through a third absorber and the first absorber, diluting an ammonia water solution in the second absorber through a dilution system, and introducing the diluted ammonia water solution into an SNCR reactor;
introducing waste gas generated by the aerobic fermentation tank into a third absorber, discharging the waste gas after the waste gas sequentially passes through the first absorber and the second absorber, diluting an ammonia water solution in the third absorber by a dilution system, and introducing the diluted ammonia water solution into the SNCR reactor;
and repeating the steps and circularly operating.
4. The method for SNCR denitration of flue gas by ammonia water production from aerobic composting waste gas as claimed in claim 3, wherein NH is respectively arranged on the gas outlet pipeline of the aerobic fermentation tank and the gas outlet pipeline of the absorber3And (5) detecting an alarm.
5. The method for preparing ammonia water from aerobic composting waste gas for SNCR denitration of flue gas as claimed in claim 1 or 3, wherein the water added into the absorber is sewage plant water.
6. The method for SNCR denitration of flue gas by ammonia water produced from aerobic composting waste gas as claimed in claim 1 or 3, wherein the water inlet pipeline, the water outlet pipeline, the air inlet pipeline, the exhaust pipeline and the connecting pipeline between the absorbers are respectively provided with an electromagnetic valve.
7. The method for preparing ammonia water from aerobic composting waste gas for SNCR denitration of flue gas as claimed in claim 1 or 3, wherein an ammonium ion detector is respectively arranged in the absorbers.
8. The method for preparing ammonia water from aerobic composting waste gas for SNCR denitration of flue gas as claimed in claim 1 or 3, wherein the dilution system comprises an ammonia water storage tank, an ammonia water pressure pump, a diluted ammonia water tank and a diluted ammonia water pressure pump in sequence, the ammonia water storage tank is connected with the absorber, and the diluted ammonia water pressure pump is connected with the SNCR reactor; the diluted ammonia water tank is provided with a dilution water inlet, and the dilution water is reclaimed water in a sewage plant.
9. The method for preparing ammonia water from the aerobic composting waste gas for SNCR denitration of flue gas as claimed in claim 1 or 3, wherein a circulating heat exchange system is arranged between the SNCR reactor and the aerobic fermentation tank and used for transferring heat of the SNCR reactor to the aerobic fermentation tank; the medium of the circulating heat exchange system is water in a sewage plant.
10. The method for preparing ammonia water from aerobic composting waste gas for SNCR denitration of flue gas as claimed in claim 8, wherein the exhaust pipeline of the absorber is connected with the inlet end of the dilute ammonia water tank.
CN202111312182.2A 2021-11-08 2021-11-08 Method for preparing ammonia water from aerobic composting waste gas for flue gas SNCR (selective non-catalytic reduction) denitration Pending CN113856444A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5750599A (en) * 1980-09-12 1982-03-25 Hitachi Zosen Corp Treatment of solid waste
JP2009039649A (en) * 2007-08-08 2009-02-26 Mitsui Eng & Shipbuild Co Ltd Method for producing resource from garbage
CN101948341A (en) * 2010-09-15 2011-01-19 昆明理工大学 Reactor composting device for aerobic fermentation
CN112944348A (en) * 2020-12-27 2021-06-11 上海康恒环境股份有限公司 Waste incineration grate furnace reburning denitration methane treatment system
CN216418901U (en) * 2021-11-08 2022-05-03 浙江工业大学绍兴研究院 Device for preparing ammonia water from aerobic composting waste gas for SNCR (selective non-catalytic reduction) denitration of flue gas

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5750599A (en) * 1980-09-12 1982-03-25 Hitachi Zosen Corp Treatment of solid waste
JP2009039649A (en) * 2007-08-08 2009-02-26 Mitsui Eng & Shipbuild Co Ltd Method for producing resource from garbage
CN101948341A (en) * 2010-09-15 2011-01-19 昆明理工大学 Reactor composting device for aerobic fermentation
CN112944348A (en) * 2020-12-27 2021-06-11 上海康恒环境股份有限公司 Waste incineration grate furnace reburning denitration methane treatment system
CN216418901U (en) * 2021-11-08 2022-05-03 浙江工业大学绍兴研究院 Device for preparing ammonia water from aerobic composting waste gas for SNCR (selective non-catalytic reduction) denitration of flue gas

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